Net Income Per Common Share - Net Income Per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Net Income Per Share Basic And Diluted [Abstract]
Net income	$ 2,488	$ 2,466	$ 4,600	$ 4,732	$ 9,763
Weighted average common shares outstanding	14,417,185	14,478,802	14,425,715	14,487,061
Dilutive effect of common stock options, warrants and restricted stock	299,441	294,632	308,213	295,462
Shares used in computation of net income per common share - diluted	14,716,626	14,773,434	14,733,928	14,782,523
Net income per common share - basic	$ 0.17	$ 0.17	$ 0.32	$ 0.33
Net income per common share - diluted	$ 0.17	$ 0.17	$ 0.31	$ 0.32